shader - What are the semantics in CG programming? -


msdn stated semantic string attached shader input or output conveys information intended use of parameter

unity stated semantics special clause of cg define default input values of fragment/vertex shader

what semantics? why use it? necessary?

basically tells kind of data stored in field - position, normal, texture coordinates et cetera.

it useful describe vertex format in fixed-function pipeline in programmable pipeline semantics described shader, definition in vertex format may have no sense (for example, shader may use texcoord0 normals) yet still required compiler.


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